Hobart 60PL20, Operation And Maintenance Manual

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TROUBLE, SYMPTOM TEST, CHECK, AND/OR
AND CONDITION PROBABLE CAUSE REMEDY
ENGINE AND CONTROLS (CONTINUED)
7. Engine will not come “up” D. Defective actuator D. Refer to connection and sche-
to governed speed in GEN matic diagram in Chapter 6 and
mode. (continued) apply 12-V DC to the two
actuator input lead terminals.
Actuator lever should move im-
mediately to full speed position.
If lever does not move, replace
actuator.
E. Defective governor E. Refer to connection and sche-
controller matic diagram in Chapter 6 and
connect a DC voltmeter to the
controller’s terminal strip. Start
the engine and manually control
engine speed. At speeds below
governed speed, the voltmeter
should indicate within two (2) volts
of the system voltage. If voltage
is at near zero, turn speed
adjusting screw several turns
clockwise to be sure speed
setting is not too low because
of tampering. If voltage
remains low or at zero, replace
controller. Refer to governor
instruction booklet in Chapter 6
for controller bench tests and
adjustments.
8. Engine goes to A. Governed speed con- A. Turn speed control adjust-
overspeed when con- trol adjustment set ing screw fully counterclock-
trol switch (15, too high (see 2-3, wise. Start engine. Place con-
Fig. 1) is in GEN mode. Fig. 5) trol switch (15, Fig. 1) in GEN
position. If engine speed is
now well below governed
speed, turn adjusting screw
clockwise until correct speed
(2000 RPM, 400-Hz) is attained.
If engine still goes to over-
speed, proceed to Step B.
B. Defective linkage or B. Check governor linkage and
actuator actuator for sticking or
binding in full-speed position.
Repair as required.
C. Defective controller C. Replace controller. Check
it in accordance with governor
instruction booklet in Chapter 6.
OM-2053
December 31/91 Revised 3-1
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